Just a comment and of course ; JMHO ; on the set up shown.
The goose neck ball placement in the truck appears to be in the optimum position, 2" ahead of rear axle center line, the unit will be moving the load behind the center line and actually lifting weight off the front axle of the truck.
That might make for very different handling while towing.
Why the manufacturer didn't just go straight up, is anybody's guess.